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i <br /> City of Stockton A68101.02F <br /> July 24, 1997 Page 6 <br /> TABLE 4 <br /> ' Summary of Soil Sample Analytical Results <br /> Date of Sampling: August 29, 1995 <br /> SamekJ Depth B T B X TPH-G TPH-D <br /> I.ocat kX1 Ff3SC" m&/kg mg/rg mg/kg mg/kg mg/kg mg/kg <br /> East Wall * 14 5.8 28 16 120 1,700 26 <br /> West Wall 14 ND ND ND ND ND 45 <br /> North Wall ' 14 5.9 46 23 150 3,800 ND <br /> South Wall 14 ND 0.007 ND 0.008 ND ND <br /> DLR 0.005 0.005 0.005 0.005 l.0 10 <br /> i <br /> ' Modified DLR 5.0 5.0 5.0 5.0 200 20 <br /> FBSG = Feet below site grade <br /> mg/kg = milligrams per kilogram <br /> BTEX = benzene, toluene,ethylbenzene,and total xylenes <br /> TPH-G = total petroleum hydrocarbons as gasoline <br /> TPH-D = total petroleum hydrocarbons as diesel <br /> ND = not detected at or above detection limit for reporting <br /> DLR = detection limits for reporting purposes <br /> ' DLR modified due to concentrations of analytes in sample <br /> After completion of the field work on August 29, 1995, the City of Stockton backfilled and <br /> compacted the excavation. The history and progress of this project was discussed during a <br /> meeting between representatives of the.City of Stockton, San Joaquin County Public Health <br /> Services (SJCPHS), and Twining on January 30, 1996. The consensus of those concerned <br /> was that additional soil assessment was required to delimit the lateral extent of PPC <br /> migration in subsurface soil and to gather additional data on groundwater. The work of this <br /> additional assessment is documented in the following section. <br /> i� <br /> 4.0 INVESTIGATIVE PROCEDURES <br /> This limited soil assessment consisted of: preparation of a work plan and appropriate permit <br /> applications, a field investigation, a laboratory testing program, and preparation of a <br /> summary report. Standard operating procedures (SOPs), relevant to the field and laboratory <br /> activities, are described in Appendix A. Any specific deviations from the SOPS are stated <br /> in the following sections. <br /> 4.1 Work Plan and Permit Application Approval: The work scope herein described was <br /> presented in Twining's work plan (A68101.02C) dated February 23, 1996 (Twining, 1996), <br /> modified (A68101.02D) August 7, 1996 and revised (A68101.02E) November 18, 1996. The <br />